Yeah it's about support contracts, which covers a lot of services actually such as maintaining security audited package repositories. But most importantly it's about support life cycles you can rely on for a long term investment of time and infrastructure outlays.

For example, RHEL 10 has a planned support phase out until 2035, with extended support available until 2038.

They do tend to have a different goal for their intial installation and configuration to consumer distros, with a focus on security and providing tools you will need in an enterprise hosting environment.